Quote - Wrong file. The critical data is in the .obj file, usually found in a subfolder under Geometries, but at least you don't need to mess around with a text editor, though you can do it that way. I have done. I used to post to the Fidonet DOS batch file echo. Take it as read that I'm weird. You can do it in Poser or in UVmapper, and you'll end up with a fresh version of the .obj file, and you'll have to edit the .cr2 to point it at the correct file. Poser first: Import the .obj file and open the grouping tool. You have to create a new group, but this is only temporary. You'll see two buttons: "Add Material" adds a material to the group. "Assign Material" makes the group a part of that material. Before you exit the grouping tool, delete your temporary group. You then export the mesh under a new filename. You should only have the "include existing groups" box ticked. UVmapper is similar. Load the model. You don't need to do anything with a dummmy group, just Select, By Material, and then Assign, To Material. Save the model when finished. It's possible that a .cr2 will do something clever, geometry switching and such, but there are usually just two lines which point at the geometry. When I've done this sort of thing, I've just added something to the filename, so that "foobar.obj" becomes "foobaru2.obj", which is easy to edit. Don't forget to save the .cr2 under a new name. If you're just changing a material name, rather than combining materials, you can do that as well, it's tidier. You'll then see the shrugging man symbol for the new version. You can have a Material in the .cr2, and it will appear in the Materials Room, but if there isn't a Material in the .obj file it won't do anything.

Editing the object file isn't going to help. Poser doesn't alter the original object file when
a new material zone is created with the grouping tool.  The only thing that gets
altered is the character or the prop within Poser. 
Okay, lets use this as example.  Load a box in from the props libaray.  Select the
front of the box with the grouping tool.  Press Assign Materials in the grouping
tool dialogue box and where it says name, call that Front.  Now poser hasn't
altered the original object file.  I could load in another box and the new box
wouldn't have a material zone called Front on it, only the first box.
So now I have only two options I know of if I want to get rid of a material zone called Front
that I myself created with the grouping tool.  I can delete the first box and start over.  Or I can
save the box as a pp2 file and use an editor to go in and delete the material zone I created.
Now this is relatively simple for just a box with one material zone, but it is a royal mess
for a character with multiple other zones that I have to wade through to get to the
material zone I want to delete.
What I want to know is if there is a third option.
I want  a simple way to delete a material zone that I created with the grouping tool while
I am still in Poser.  Poser lets me create material zones, why isn't there an option or a
way to rename or delete material zones from within Poser.